Spi 63-392-5 V-block 1 in 90 Degree Matched Pair Cast Iron

Product Description

The SPI 63-392-5 is a matched pair of cast iron V-blocks designed for precision workholding and inspection applications in machine shops and tool rooms. Each block features a 90-degree V angle with a maximum V capacity of 1 inch, making it suited for holding cylindrical workpieces during layout, grinding, or inspection operations. The V parallelism tolerance is 0.0002 inches (30 micrometers), and V accuracy holds to 0.0002 inches, reflecting the close tolerances required for accurate metrology and machining setups. These blocks are sold as a matched pair to ensure consistent results when supporting a workpiece at two points.

These V-blocks are used in precision measurement and machining environments, including tool and die shops, quality control labs, and general machine shop applications. They are appropriate for supporting round stock, shafts, or cylindrical parts during surface plate inspection, scribing, or cylindrical grinding setups. The non-magnetic cast iron construction suits applications where magnetic workholding is not desirable or compatible with the workpiece material.

Key Features

• Matched pair construction ensures consistent height and alignment at both support points
• 90-degree V angle with 1 inch maximum V capacity accommodates a range of cylindrical stock sizes
• V parallelism held to 0.0002 inches (30 micrometers) for precision inspection use
• Squareness tolerance of 0.0012 inches per inch ensures accurate perpendicular referencing
• Non-magnetic cast iron body resists wear and provides stable, rigid workpiece support
• Large V width of 0.75 inches provides broad contact surface for secure part seating

Compatibility

Designed as a general-purpose precision V-block set for use with cylindrical workpieces up to 1 inch in diameter on surface plates and machine tool setups.

Installation Notes

V-blocks are typically set up by machinists and quality control technicians on a surface plate or machine table. Clean mating surfaces before placement to ensure accurate seating and prevent measurement error from debris. Secure the workpiece with a V-block clamp or strap when performing operations that apply lateral force. Handle cast iron components with care to avoid chipping the precision-ground surfaces.